Twincest

When two twins both female do anything sexual to either each other or to someone else with each other.

The twins both screamed at the word twincest.

by PainCorp July 11, 2004

Twincest

When twins get together in a odd and disturbingly immoral relationship to the out side world. A mix of incest and twins.

Laurie: damn you see those blonde twins over there, they are having a twincestual relationship
Josh: that is gross, and not to mention immorally disturbing.
Laurie: damn straight it is,andi thought the girl was hot.
Josh: obviously so did her brother.
Laurie: just like those gay scots the proclaimers.
Josh: lool

by Chizeej- on behalf of Lozz April 25, 2007

Tincest

When you accidentally swipe right on a family member on Tinder.

"I accidentally swiped right on my sister..." "That's tincest, my man."

by Iancohen May 8, 2015

Twincest

An incest between twins!

Ex:
Wow, Michael and Matthew are twincest GOALS!

by BobbySmallGland November 17, 2018

twincestual

Twin + incestual

That is fucking horridly twincestual.

Do not go on TwinTok, there’s a lot of twincestual content.

by LingDanc803 October 28, 2023